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author | Linus Torvalds <torvalds@linux-foundation.org> | 2010-05-21 19:37:45 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-05-21 19:37:45 -0700 |
commit | e8bebe2f71d26871b0970ae1d9cf0ed3cdd9569d (patch) | |
tree | c0d82cbd11daaf579b74121c6641d58947091094 /fs/sync.c | |
parent | 6109e2ce2600e2db26cd0424bb9c6ed019723288 (diff) | |
parent | 82f3952c02add60b15eea9151d4d99b6b82066c6 (diff) | |
download | lwn-e8bebe2f71d26871b0970ae1d9cf0ed3cdd9569d.tar.gz lwn-e8bebe2f71d26871b0970ae1d9cf0ed3cdd9569d.zip |
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6: (69 commits)
fix handling of offsets in cris eeprom.c, get rid of fake on-stack files
get rid of home-grown mutex in cris eeprom.c
switch ecryptfs_write() to struct inode *, kill on-stack fake files
switch ecryptfs_get_locked_page() to struct inode *
simplify access to ecryptfs inodes in ->readpage() and friends
AFS: Don't put struct file on the stack
Ban ecryptfs over ecryptfs
logfs: replace inode uid,gid,mode initialization with helper function
ufs: replace inode uid,gid,mode initialization with helper function
udf: replace inode uid,gid,mode init with helper
ubifs: replace inode uid,gid,mode initialization with helper function
sysv: replace inode uid,gid,mode initialization with helper function
reiserfs: replace inode uid,gid,mode initialization with helper function
ramfs: replace inode uid,gid,mode initialization with helper function
omfs: replace inode uid,gid,mode initialization with helper function
bfs: replace inode uid,gid,mode initialization with helper function
ocfs2: replace inode uid,gid,mode initialization with helper function
nilfs2: replace inode uid,gid,mode initialization with helper function
minix: replace inode uid,gid,mode init with helper
ext4: replace inode uid,gid,mode init with helper
...
Trivial conflict in fs/fs-writeback.c (mark bitfields unsigned)
Diffstat (limited to 'fs/sync.c')
-rw-r--r-- | fs/sync.c | 86 |
1 files changed, 14 insertions, 72 deletions
diff --git a/fs/sync.c b/fs/sync.c index de6a44192832..e8cbd415e50a 100644 --- a/fs/sync.c +++ b/fs/sync.c @@ -77,50 +77,18 @@ int sync_filesystem(struct super_block *sb) } EXPORT_SYMBOL_GPL(sync_filesystem); +static void sync_one_sb(struct super_block *sb, void *arg) +{ + if (!(sb->s_flags & MS_RDONLY) && sb->s_bdi) + __sync_filesystem(sb, *(int *)arg); +} /* * Sync all the data for all the filesystems (called by sys_sync() and * emergency sync) - * - * This operation is careful to avoid the livelock which could easily happen - * if two or more filesystems are being continuously dirtied. s_need_sync - * is used only here. We set it against all filesystems and then clear it as - * we sync them. So redirtied filesystems are skipped. - * - * But if process A is currently running sync_filesystems and then process B - * calls sync_filesystems as well, process B will set all the s_need_sync - * flags again, which will cause process A to resync everything. Fix that with - * a local mutex. */ static void sync_filesystems(int wait) { - struct super_block *sb; - static DEFINE_MUTEX(mutex); - - mutex_lock(&mutex); /* Could be down_interruptible */ - spin_lock(&sb_lock); - list_for_each_entry(sb, &super_blocks, s_list) - sb->s_need_sync = 1; - -restart: - list_for_each_entry(sb, &super_blocks, s_list) { - if (!sb->s_need_sync) - continue; - sb->s_need_sync = 0; - sb->s_count++; - spin_unlock(&sb_lock); - - down_read(&sb->s_umount); - if (!(sb->s_flags & MS_RDONLY) && sb->s_root && sb->s_bdi) - __sync_filesystem(sb, wait); - up_read(&sb->s_umount); - - /* restart only when sb is no longer on the list */ - spin_lock(&sb_lock); - if (__put_super_and_need_restart(sb)) - goto restart; - } - spin_unlock(&sb_lock); - mutex_unlock(&mutex); + iterate_supers(sync_one_sb, &wait); } /* @@ -190,7 +158,6 @@ EXPORT_SYMBOL(file_fsync); /** * vfs_fsync_range - helper to sync a range of data & metadata to disk * @file: file to sync - * @dentry: dentry of @file * @start: offset in bytes of the beginning of data range to sync * @end: offset in bytes of the end of data range (inclusive) * @datasync: perform only datasync @@ -198,32 +165,13 @@ EXPORT_SYMBOL(file_fsync); * Write back data in range @start..@end and metadata for @file to disk. If * @datasync is set only metadata needed to access modified file data is * written. - * - * In case this function is called from nfsd @file may be %NULL and - * only @dentry is set. This can only happen when the filesystem - * implements the export_operations API. */ -int vfs_fsync_range(struct file *file, struct dentry *dentry, loff_t start, - loff_t end, int datasync) +int vfs_fsync_range(struct file *file, loff_t start, loff_t end, int datasync) { - const struct file_operations *fop; - struct address_space *mapping; + struct address_space *mapping = file->f_mapping; int err, ret; - /* - * Get mapping and operations from the file in case we have - * as file, or get the default values for them in case we - * don't have a struct file available. Damn nfsd.. - */ - if (file) { - mapping = file->f_mapping; - fop = file->f_op; - } else { - mapping = dentry->d_inode->i_mapping; - fop = dentry->d_inode->i_fop; - } - - if (!fop || !fop->fsync) { + if (!file->f_op || !file->f_op->fsync) { ret = -EINVAL; goto out; } @@ -235,7 +183,7 @@ int vfs_fsync_range(struct file *file, struct dentry *dentry, loff_t start, * livelocks in fsync_buffers_list(). */ mutex_lock(&mapping->host->i_mutex); - err = fop->fsync(file, dentry, datasync); + err = file->f_op->fsync(file, file->f_path.dentry, datasync); if (!ret) ret = err; mutex_unlock(&mapping->host->i_mutex); @@ -248,19 +196,14 @@ EXPORT_SYMBOL(vfs_fsync_range); /** * vfs_fsync - perform a fsync or fdatasync on a file * @file: file to sync - * @dentry: dentry of @file * @datasync: only perform a fdatasync operation * * Write back data and metadata for @file to disk. If @datasync is * set only metadata needed to access modified file data is written. - * - * In case this function is called from nfsd @file may be %NULL and - * only @dentry is set. This can only happen when the filesystem - * implements the export_operations API. */ -int vfs_fsync(struct file *file, struct dentry *dentry, int datasync) +int vfs_fsync(struct file *file, int datasync) { - return vfs_fsync_range(file, dentry, 0, LLONG_MAX, datasync); + return vfs_fsync_range(file, 0, LLONG_MAX, datasync); } EXPORT_SYMBOL(vfs_fsync); @@ -271,7 +214,7 @@ static int do_fsync(unsigned int fd, int datasync) file = fget(fd); if (file) { - ret = vfs_fsync(file, file->f_path.dentry, datasync); + ret = vfs_fsync(file, datasync); fput(file); } return ret; @@ -299,8 +242,7 @@ int generic_write_sync(struct file *file, loff_t pos, loff_t count) { if (!(file->f_flags & O_DSYNC) && !IS_SYNC(file->f_mapping->host)) return 0; - return vfs_fsync_range(file, file->f_path.dentry, pos, - pos + count - 1, + return vfs_fsync_range(file, pos, pos + count - 1, (file->f_flags & __O_SYNC) ? 0 : 1); } EXPORT_SYMBOL(generic_write_sync); |